10. In mice, an allele for apricot eyes (a) is recessive to an allele for brown
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Question
10. In mice, an allele for apricot eyes (a) is recessive to an allele for brown eyes (a+). An allele for tan coat color (t) is recessive to an allele for black coat color (t+). These characters assort independently (are not linked on the same chromosome). A mouse that is homozygous for brown eyes and black coat is crossed with a mouse having apricot eyes and a tan coat. A. What will be the genotype and phenotype of the F1 generation? B. What will be the probability of the following phenotypes in the F2: brown eyes; apricot eyes; black coat; tan coat? C. In a litter of eight F2 mice, what is the probability that two mice will have apricot eyes and tan coats? (Hint: use binomial expansion.)Explanation / Answer
A. The genotype of F1 will be a+at+t and the phenotype will be brown eyes and black coat.
B. The probability of the following phenotypes ie: Brown eyes tan coat and apricot eyes black coat will be 3/16, 3/16 respectively.
C. 1/8 x1/8=1/64
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